Terminal plug and sheath for electric cables



Sept. 27, 1927. 1,643,462

I H. KOCOUREK TERMINAL PLUG AND SHE ATH FOR ELECTRIC CABLES ,Filed Oct.1926 Z V'eJpZ OJ Z w :ifez z z i flocozzfeh. ig 3, 3 @WM trating theeffect of "end UNITED s rarimfr'Otfiucal;

Hanna I KOCOU B' EK', OF CHICAGO, ILLINOIS, COMPANY, OF CHICAGO,ILLINOIS,

A, COBPQBA'ITION OIILLINOIS.

rnnmmAL-rnoo. Ann s nnarnlron. ammo enemas.

' Application filed. October a, 1926. sc -"m1 111p 143,486.

The purpose of this invention is to prgvide a sheath which shall beadapted'for s cure attachment to electric cable enlargement of thelatter, while at the same time ailording ample clearance within thissheath around the cable to avoid chafing the insulating covering in theflexure of the cable and sheath, and in such flexure to permit the cableto bend in'a curve of greater radius than that of the bend of thesheath.

The invention consists in the elements and features of constructionshown and described as indicated in the. claim.

In the drawings: a

Figure 1 is a sect-'on, axial with respect to the electric cable, of aterminal plug for such cable equipped with a sheath in a mannerexemplifying this. invention. 1

Figure 2 is a axial section the plug body, coupling bushing, adjacentterminal of securing nut.

Figure 3 is a 33, of Figure 1, showing the parts upon a magnified scale.

Figure 4 isa diagrammatic view for illus the construction for avoidingabruptbending of the conducting wires in. flexing the cable at the partprotected by the sheath.

' Figure 5 isa. section at line 5-5 on Figure 3. y 1

' In the structure shown in the drawings, A is an insulating body of theterminal plu of an electric coupling cable of conventions. form,commonly employed'ior coupling to anelectric iron or other electricalheatipg device. B is the electric cable-having i eading andoutleadingwires, "10 and 11,

tact sockets, 12 and 13, carried by-the plug, C is. a bushing havingintermediate its ends an encompassing boss, 15, and adapted at the endortion, ;16, to plug ha y, A, as by being screwed at said ortion' intothe the ody, being sto .ped' longitudinally by the shoulder, 15, o theannular flange or boss, 15, the bushing having the end ortion threadedas seen at 18. D is the sheath made of coiled spring wire having alimited number of coils, as seen at 20, of diameter. to admit the cableand fit it rather closely so as -not to defeat easy 1on the terminalplug of an' connection without requiring 21, this tapered portion belngdissected view presenting in the sheath, and thedetail semen onthe'line,

ceive; for it will be engaged with the hub or end boss,'a, of

sheath wire-to efie'ct connection.

opposite largement of the coil gitudinal: movement, the tlnued fromthese close coils at the outer .end portion any desired lengthof thecable,

but as thefplug-connected'end of the sheath 1s approached the coils-aregradually increased in diameter, rendering the sheath exteriorly andinteriorly tapered, as seen ,at. followed by a portion, 22, in which thecoils are close and of successively increasing diameter, continuing totaper until the interior diam eter becomes such that the close coilsconstitute an inter or thread adapted to engage the exterior thread '18of the bushing, and when this diameter is reached the remain-' ingcoils, 23, eter; and it will be understood that this sheath. being con-I nssienon-r'o cirrc'aoo rnnxnsna snn'r to the end are of uniform diamthread, 18, of the bushing is formed, as to pitch and depth, atescrewwise with the close coiled terminal part, 23, of the etered forbeing passed onto the sheath from the smaller end, adapted to engage theclose coiled portion, 23, of the, sheath atthe larger end, and threadedfor screwing'onto sai close coiled part up to the shoulder, 15", of thebushing, 15. By this means the sheath so'as to be fitted to co'-oper-,

sheath. E is a nut diamdad is rendered inseparable from .the plug bywhich the sheath ma 'rebe observed that the direction in which thesheath would have to be rotated to unscrew it from between thebushingand the nut .is the direction for tightening the coil,

any screw action that terof the coil, and such tightening makes the griof the the bus ing tighter and applied sheath between the bushing andthe .nut. This expedient for securing the sheath to the.

ofthe hub, a, of theplug body to afi'ocd engagement of the. is commonconstruction for securing the sheath to the plug body, and avoids weak-vening the 'hub or en 0 lug body may be provided for like puiipose yaperturing it for'th'e engagement- '0 the by the service of theimplement to which it is for reducing the'diame T coil uponthe threadoftighter as force is v,ifor attempting to thus rotate the secured inthe usual manner to separate conplug avoids anv necessit for enlargementsheath within'th e latter, as

ss with which the At the v 105. diameter at the end plug is attached forushingv permits the adapted at one end rior y 'is connected, to normallyassume a curve of greater radius than that of the inner side of thebend-.ofthe sheath, as seen in Figure 4; and bythis means abrupt bendingof the cable at its emergence from the plug body is revented.

claim In a device for the purpose stated, in combination with the renderthe sheath taperingly enlarged. to-

bod

ward one end and having the extreme end portion following saidtaperingly enlarged part coiled close and of uniform diameter, theexterior thread of the bushing being conformed to said close-coileduniform di ametered end portion of the sheath for receiving the latteras a female thread, and a nut diametered for passing over the coiledsheath from the smaller end of the tapered part and threaded for sore-Wengagement with and outside of the uniform diametered close-coiled endportion of the sheath inside whic the bushing is screwed.

'In testimony whereof, I have hereunto set my hand at Chicago Illinois,this 20th day of October, 1926.

HENRY KOCOUREK.

